Thermally stable polyester, process for its preparation and...

Details Thermally stable polyester, process for its preparation and... Thermally stable polyester, process for its preparation and...

2005-01-11

2005-01-11

Woodward, Ana (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

C428S364000, C442S181000, C442S327000, C524S497000, C524S537000

Reexamination Certificate

active

06841604

ABSTRACT:
A polyester with a carbon black content of up to 20% by weight, based on the polyester, is condensed, after transesterification of DMT with diol, or after esterification of terephthalic acid with diol, with the aid of a titanium-based catalyst. The carbon black is added in the form of a carbon black dispersion together with the polycondensation catalyst to the transesterification product or esterification product. The carbon black dispersion comprises gas black or furnace black and a dispersing agent, and these are dispersed in diol. The diameter of the carbon black particles is below that of carbon black particles in a polyester using an antimony compound as catalyst.

REFERENCES:
patent: 4476272 (1984-10-01), Pengilly
Hamada, S. et al., Improving Dispersibility of Carbon Black in Polyesters, Patent Abstract of Japan, Application No. JP 72-26106, File Date Mar. 16, 1972.
Watanabe, K. et al., Uniform Polyesters Containing Carbon Black Producing Smooth-Surface Films, Patent Abstract of Japan, Application No. JP 87-144831, File Date Jun. 10, 1987.
Kondo, F. et al., Polyester Coloring Composition, Patent Abstract of Japan, Application No. JP 70-120212, File Date Dec. 28, 1970.
Honma, M. et al., Black-Colored Polyesters, Patent Abstract of Japan, Application No. JP 73-65445, File Date Jun. 12, 1973.

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